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Technical Brief

Cavitation Erosion Resistance of Silicified Graphite by Liquid Silicon Penetration Technique

[+] Author and Article Information
Hongqin Ding

School of Mechanical Engineering,
Southeast University,
2 Southeast Road, Jiangning District,
Nanjing 211189, China

Shuyun Jiang

Professor
School of Mechanical Engineering,
Southeast University,
2 Southeast Road, Jiangning District,
Nanjing 211189, China
e-mail: jiangshy@seu.edu.cn

1Corresponding author.

Contributed by the Tribology Division of ASME for publication in the JOURNAL OF TRIBOLOGY. Manuscript received September 30, 2016; final manuscript received January 18, 2017; published online June 5, 2017. Assoc. Editor: Dae-Eun Kim.

J. Tribol 139(6), 064501 (Jun 05, 2017) (5 pages) Paper No: TRIB-16-1302; doi: 10.1115/1.4035869 History: Received September 30, 2016; Revised January 18, 2017

This technical brief studied the cavitation erosion behavior of the silicified graphite. The phase constituents, surface microstructure, and chemical compositions of silicified graphite were examined by using X-ray diffraction (XRD), scanning electron microscopy (SEM), and energy dispersive spectroscopy (EDS), respectively. Cavitation experiments were carried out by using an ultrasonic vibration test system. The experimental results show that the silicified graphite exhibits an excellent cavitation erosion resistance; this can be attributed to the fact that the silicified graphite has the characteristics of both the silicon carbide and the graphite. The SEM morphology studies of the erosion surfaces indicated that the inherent brittleness of SiC ceramic material results in the formation of erosion pits on the surface of silicified graphite.

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References

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Figures

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Fig. 1

(a) The ultrasound vibration system—photo, (b) the ultrasound vibration system—schematic diagram of system, and (c) the ultrasound vibration system—specimen

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Fig. 2

(a) EDS analysis of silicified graphite—The selected area for EDS analysis and (b) EDS analysis of silicified graphite—analysis result

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Fig. 3

XRD pattern of the silicified graphite

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Fig. 4

(a) Photo after 14 h. of cavitation test in the tap water—M165, (b) photo after 14 h. of cavitation test in the tap water—M158K, and (c) photo after 14 h. of cavitation test in the tap water—silicified graphite

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Fig. 5

(a) Silicified graphite after 14 h. of cavitation test in different test liquids—before test, (b) silicified graphite after 14 h. of cavitation test in different test liquids—tap water, (c) silicified graphite after 14 h. of cavitation test in different test liquids—3.5% saline water, and (d) silicified graphite after 14 h. of cavitation test in different test liquids—sand water of 3 kg/m3

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Fig. 6

The mass loss curve of carbon, impregnated, and silicified graphite in the tap water

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Fig. 7

The mass loss curve of silicified graphite in different test liquids

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Fig. 8

(a) The SEM images of carbon graphite and impregnated graphite after 14 h. test in the tap water—carbon graphite and (b) the SEM images of carbon graphite and impregnated graphite after 14 h. test in the tap water—impregnated graphite

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Fig. 9

(a) The SEM images of silicified graphite after 14 h. test in different test liquids—before test, (b) the SEM images of silicified graphite after 14 h. test in different test liquids—tap water, (c) the SEM images of silicified graphite after 14 h. test in different test liquids—3.5% saline water, and (d) the SEM images of silicified graphite after 14 h. test in different test liquids—sand water of 3 kg/m3

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Fig. 10

The pit by brittle fracture of the silicified graphite

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